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i ED srA'rEs ATENT, OFFICE.

MONROE S. GLA'WSOIN', F BELLEVILLE, NEW JERSEY.

ALLOY FOR STEEL FOR CASTING HIGH-SPEED TOOLS.-

We Drawing.

To all whom itmay concern:

Be it known that I, MONROE Cmwson,

a citizen of the United States, residing at Belleville, in the county ofEssex and State of New Jersey, have invented certai-n'new and useful Irprovementsin Alloys for Steel for Casting 1gh-Speed Tools, of whichthe following is a specification.

This invention relates to alloys' for steel" and has for its object the provision of an alloy having a high percentage of carbon :content whereby the metal produced will ossess too great a degree of hardness to be hammered or worked but yet be capable of being annealed, machined, and tempered.

More specifically the invention resides in the provision of an alloy consisting essentially of iron, tungsten, chromium, vanadium, silicon, and carbon in varying proportions, the carbon particularly rangmg from 135% to It iswell known that the regular method of handling so called high speedsteel is making it with a low carbon content, varying from 30% to .85%carbon so that the steel can be hammered or worked. By a series of experiments I have found that by casting, a steel can be used having as high a carbon content as 3%,;% and produce a tool that is superior to any other combination.

In carrying out my invention, I preferably use a combination of elementsvin the following varying proportions:

Tron 82.40 to 62.25% Tungsten 13 to 25 Chromiunn 2-} to 5 Vanadium l; to 3 Carbon .85to 3% Silicon .30to 1.50%

Specification of Letters Patent. Patented Sept, 9, 1919, Application filed November 19, 1913. Serial No. 263,173. i

The above mixture is made and the elements combined in the usual manner,using the ordinary scavengers and purifiers such as manganese, t1tan1um,a'lunnnum, uranium,

etc.

Various alloys have been experimented: with and certainof them have been found" a to be capable of casting but could not be an.-

nealed so that their use was impracticable as it was impossible to make the keyways,

etc, or have a multiplicity of cutting ecl es as 1n milling tools, owing to the great d1 culties encounterediin machining.

In the above specified alloy'a large range in the proportions ofthe ingredients is possible, as willbe noted. This alloywith a carbon content of 7 5% is just hard enough to necessitate carefuL handling in hammering and with acarbon content of 3;%;% is too hard to anneal suh'iciently to machine.

chromium, to 3% vanadium, .85 to 31}%' carbon, and .30 to 1.50% silicon.

Tn testimonywhereof I hereto affix my a signature.

' MONROE s. oriawson. 

